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A seriatim opinion describes an opinion delivered by a court with multiple judges, in which each judge reads his or her own opinion rather than a single judge writing an opinion on behalf of the entire court. This is a practice generally used when a case does not have a majority opinion.

Most frequently used in modern times (when used at all) pleadings as a shorthand for "one by one in sequence". For example, in Englishcivil cases, defence statements generally used to conclude with the phrase "save as expressly admitted herein, each allegation of the plaintiffs is denied as if set out in full and traversed herein seriatim." This formulation is now discouraged under the English Civil Procedure Rules, especially rule 16.5 (3)-(5).[1]

Also sometimes seen in older deeds and contracts as a more traditional way of incorporating terms of reference. For example "the railway by-laws shall apply to the contract as if set out herein seriatim."

It is sometimes found as part of the longer phrase brevatim et seriatim, meaning "briefly and in series".

The term is also used when replying to a communication that contains a number of points, issues or questions to denote that the responses are in the same order in which they were raised in the original document: "To deal with your queries seriatim..."

In 2009, Title III, Rule 15(a)(1) of the U.S. Federal Rules of Civil Procedure regarding Amended and Supplemental Pleadings (part of pretrial procedure) was amended to allow three changes in the time previously allowed to make one change.[2]

This provision will force the pleader to consider carefully and promptly the wisdom of amending to meet the arguments in the motion... and will expedite determination of issues that otherwise might be raised seriatim.

The right to make changes now ends 21 days after service of a motion.[2]